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Towards a better understanding of shallow seismic anomalies in the dutch offshore

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Author: Veen, J.H. ten · Bruin, G. de · Verweij, J.M. · Donders, T.
Type:article
Date:2014
Publisher: European Association of Geoscientists and Engineers, EAGE
Source:Shallow Anomalies Workshop: Indications of Prospective Petroleum Systems?
Identifier: 524096
doi: doi:10.3997/2214-4609.20147367
Keywords: Energy resources · Petroleum deposits · Petroleum reservoir evaluation · Critical production · Economic potentials · Exploration and productions · Exploration data · Petroleum systems · Reservoir-property prediction · Shallow seismic · Southern North Sea · Offshore gas fields · Earth / Environmental · GM - Geomodelling · ELSS - Earth, Life and Social Sciences

Abstract

Recent exploration and production activities in the Cenozoic Southern North Sea (SNS) deltas, proved the economic potential of shallow gas resources, especially if located near existing infrastructures. Nonetheless, shallow gas production is still limited due to a lack of insight in the petroleum system, especially with respect to the relation between the anatomy of the delta and charging/trapping conditions. In order to mature the shallow gas play, a multidisciplinary workflow was applied to the SNS delta that involves 1) the reconstruction of the internally complex delta body, 2) a combined deterministic/stochastic approach to make reservoir property predictions, 3) evaluation of the HC origin, and 4) a grain-size based method to predict the seal-integrity of the sealing clay layers. The results present the first steps towards derisking the shallow gas play in terms of trapping geometry, seal capacity, sourcing and migration. The presented workflow is applicable to areas were limited exploration data is available, but where critical production data is (still) missing.